Phenyl propionic acids and derivatives thereof

ABSTRACT

Novel Beta -(3-chloro-4-cyclohexylphenyl)- Alpha -benzoyloxy propionic acid and its esters and salts are described.

United States Patent [191 Diamond PI-IENYL PROPIONIC ACIDS AND DERIVATIVES THEREOF [75] Inventor: Julius Diamond, Lafayette Hills, Pa.

[73] Assignee: William H. Rorer, Inc., Fort Washington, Pa.

221 7 Filed: July 12, 1973 21 Appl. No.: 378,740

Related US. Application Data [62] Division of Ser. No. 164,822, July 21, 1971,

abandoned.

[4 1 Sept. 2, 1975 [51] IntfCl. C07C 69/78 [58] Field of Search..... 260/476, 473 A, 477, 448 R [56] References Cited FOREIGN PATENTS OR APPLICATIONS 1,952,360 6/1970 Germany 260/473 A OTHER PUBLICATIONS Chemical Abstracts, Vol. 75, 5521d, (1971). Chemical Abstracts, Vol. 72, 89980b, (1970). Chemical Abstracts, Vol. 76, 2] 187a, (1972).

Primary Examiner-Lorraine A. Weinberger Assistant Examiner-E. Jane Skelly Attorney, Agent, or Firm-Erich M. H. Radde [57] ABSTRACT Novel B-( 3-chloro-4-cyclohexylphenyl )-a-benzoyloxy propionic acid and its esters and salts are described.

2 Claims, No Drawings PHENYL PROPIONIC ACIDS AND DERIVATIVES THEREOF This is a division, of application Ser. No. 164,822, filed July 21, 1971, now abandoned.

SUMMARY OF THE INVENTION This invention describes novel a-substituted p-cycloalkylphenyl-propionic acids and their derivatives and their use in therapeutic compositions. In addi tion, this invention relates to the preparation of a-substituted p-cycloalkylphenylpropionic acids. When the compounds of this invention are administered to mammals, they afford significant treatment of inflammation and associated pain and fever.

They further provide analgesic and antipyretic methods for the relief and treatment of pain and fever associated with inflammation.

BACKGROUND OF THE INVENTION There has been continued efforts in research to develop drugs which would significantly inhibit the development of inflammation and relieve the pain and fever associated with it. Much of these efforts have been carried on in the field of steroids. While many of these compounds have been effective, they have had the drawback of causing many side effects.

I have unexpectedly found that a-mercapto-pcycloalkylphenyl-propionic acid compounds and their derivatives have valuable pharmacologic properties.

I have found that a-mercapto-p-cycloalkylphenylpropionic acid compounds and their derivatives possess useful anti-inflammatory, analgesic and anti-pyrctic properties.

I have also found a series of anti-inflammatory compounds which are non-steroidal.

I have further found that these oz-mercapto-pcycloalkylphenyl-propionic acid compounds and their derivatives are novel.

I have also found that the compounds of this invention are useful in effectively providing a method for the inhibition of inflammation and the treatment of associated pain and fever.

I have still further found an entirely new class of antiinflammatory, analgesic and antipyretic pharmaceutical compositions containing the a-mercapto-p cycloalkylphenylpropionic acids and derivatives of this invention as active ingredient.

I have again found a convenient method for synthesizing these compounds.

DESCRIPTION AND PREFERRED EMBODIMENT I comprises derivatives of said propionie acids and the method, of preparing the same. i

i This invention also describes a new method of treating inflammation and associated pain and fever as well as novel therapeutic compositions.

The compounds of this invention can be represented by the generic structure which is described by the general formula I.

in which Z is hydroxyl,

lower alkoxy,

phenyl lower alkoxy, or

the group OM in which M is an alkali metal, alkaline earth metal, aluminum, ammonium, or di-lower alkyl ammonium.

The compounds of this invention contain asymmetric carbon atoms in the alpha-position of the acid side chain. As a result, the above compounds of formula I may be obtained as racemic mixtures of their dextro and levorotatory isomers. It is to be understood that said d and I isomers as well as the dl mixtures thereof are embraced within the scope of this invention.

In the descriptive portions of this invention, the following definitions apply:

The term lower alkyl" refers to a lower alkyl hydro carbon group containing from I to about 6 carbon atoms which may be straight chained or branched.

Lower alkoxy signifies an alkoxy group containing from I to about 6 carbon atoms which may be straight chained or branched.

The preferred alkali or alkaline earth metals are sodium, potassium, calcium and magnesium.

The term ammonium salt refers to the cation formed when ammonia or an organic amine react with the carboxyl group to form ammonium salts of the structure driven in the formula. The ammonium salts are formed with a I loweralkylamines such as methylamine, diethylamine, triethylamine (2) hydroxyloweralkylamines such as ,B-hydroxyethylamine; (3) heterocyclic amines such as 2-aminopyridine, piperazine; piperidine, (4) aralkylamines such as a-methylbenzylamine, phenethylamine; (5) cycloalkylamines such as cyclohexylamine; (6) alkaloids such as quinine, cinchonidine, cinchonine, ephedrine.

A representatives compound of this invention is: a-benzoyloxy -B-( 3-chloro-4-cyclohexylphenyl )propionic acid The compounds of this invention may be prepared from known starting materials. p-Cycloalkylbenzaldehyde may be (a) halogenated or (b) nitrated to obtain a corresponding 3-halo-4-cycloalkylbenzaldehyde or a 3-nitro-4-cycloalkylbenzaldehyde. Chlorination or bromination may be carried out in the presence of a small amount of iodine dissolved in an inert solvent such as carbon tetrachloride. A solution of chlorine or bromine is then added while the temperature is held near 0C.

itration is carried out with fuming nitric acid at about ,8-( p-cycloalkylphenyl)acrylic a'cid. Addition to the C. The following reaction equation illustrates this double bond with chlorine or bromine. results in a plethod. cycloalkylphenyl-a,B-dihalopropionic acid or ester. Al-

C1 or Br HN0 2 2 zln H0 (CH cno N 2 Cl (Br) Claisen condensation of a p-cycloalkyl substituted kali hydrolysis of the dihalide results in the B-(p- :nzaldehyde with an acetic acid ester (preferably the cycloalkylphenyl) pyruvic acid or ester which on hyweralkyl or benzyl ester) in the presence of a metal drogenation in the presence of platinum'oxide catalyst koxidc results in a B-(p-cycloalkyphenyl) acrylic es- 30 yields the desired lactic acid or ester. This hydrogenar. The aldehyde may also be subjected to a Perkin re: tion may also be accomplished by selective reduction :tion with acetic anhydride and an acetic acid salt or with sodium borohydride when catalytic hydrogenation rough a Knoevenogel condensation using malonic is impractical because of the presence of a sensitive :id and ammonia in an amine base to obtain a nitro group.

H0 $$fla (CH CH=.CHCOOR" CH (C00H) NH (til-l H=CHCQOH C1 or Br C1 or Brz B I 5 v I R (Br) (Br) R (g u l (:1 c1 (Cl-l2) CH-CHC00H l CH-CH-COOR" alkali alkali B i v B R.

O 0 l ll (CH CH -C-CO0H (CHE) CH -C-C00R H or NaBH H or NalBH OH OH where R" is loweralkyl or bcnzyl. The B-(p-cycloalkylphenyl)pyruvatc ester is con- Asubstituted p-cycloalkylbenzaldehyde may also be verted to the corresponding B-(p-eycloalkylphenyl)laccondensed with bippuric acid in the presence of sodium tate ester by hydrogenation in the presence of platinum acetate and acetic anhydride according to the method oxide. in the special case when R and R is a substituent of Cavalline and Massarani as outlined in their Italian sensitive to catalytic hydrogenatiom e.g., when R or R' Patent No. 61 1,973 (1960): [Chem. Abstracts is N0 SH, SR, SOR, 1, etc.. a selective reduction of 55,19868g]. This condensation results in a 2-phenyl-4- the keto function is effected with sodium horohydride (p-cycloalkyl)-5-oxazolone which on basic hydrolysis to give the B-(p-cycloalkylphenyl) lactate ester. The results in the B-(p-cyeloalkylphenyl)pyruvic acid. This lactate esters are hydrolyzed with an aqueous alcoholic may then be reduced or treated with a Grignard reaalkali hydroxide mixture to the corresponding ,B-(pgent as above to the corresponding lactic acid. cyeloalkylphenyl) lactic acid.

s: 5 H -RH B R HOCO COC H H CHO ow cu=cI T l O=C C-C H R t 0 6 5 [alkali 5 0 ii (01 C) CH CCO0H Other reactions can be carried on in a similar manner to obtain the desired suhstituent. OH

,8-( p-cycloalkylphenyl )pyruvates react with aqueous- 31C KOH alcoholic alkali hydroxide or alkali carbonate to give :12)?! 0 TS I the corresponding B-(p-cycloalkylphenyl )pyruvic acid. "a". d u

,3 R' R an fi-t 9 NaCO n 3 B CH -C-COOR R 2 3 (CH CH -C-COOH '3 R' a l i; R e H in Q CH -CC0OH Catalytic hydrogenation of a ,B-( p-cycloalkylphenyl R lactate bcnzyl ester over palladium results in the reduction of the keto group and hydrogenolysis of the benzyl group to give a B-(p-cycloalkylphenyl) lactic acid. R

. CH (|ICOOH -a e I R B R g B 8 7 OH l 2 n z' z s s (CH H C-COOM l R R a OH The ,B-( 3-chloro-4-cyclohexylphenyl )-0z-benzoyl0xy H COOH propionic acid compounds of the present invention and 2 other a-ac lated -(4-cycloalkylphenyl)lactic acid compounds are produced by reacting the corresponding B-(4-cycloalkylphenyl)lactates or lactic acids with an acid chloride or acid anhydride in the presence of a tertiary amine such as pyridine, picoline or quinoline. This reaction results in the formation of an hydroxy derivatives of the lactate or lactic acid. Examples of the acid chloride or acid anhydride include acetyl chloride, acetic anhydride, propionyl chloride,buty'ryl chloride, succinic anhydride, maleic anhydride, phthalic anhydride, benzylchlorocarbonate, ethyl c hloroearbonate, dimcthylcarbarnyl chloride, dibutyl carbamyl chloride, benzcnesulfonyl chloride, mcthanesulfonyl chloride, and more particularly benzoylchloridc and be nzoie This invention further describes the acid addition :alts formed by the action of one equivalent of a suitible base with the B-( pcycloall ylphenyl)lactic acid. iu itable bases thus include for example the alkali metal ilkoxides such as'sodium methoxide. etc., and the al- :ali metal and alkaline earth metal hydroxides fcarhonmes. bicarbonates, etc. (such as sodium hydroxide, pof fkf assium hydroxide, calcium hyroxide. potassium .car- 0 onatc, sodium bicarbonate, magnesium bicarbonate, 0

- ll COAY -tc. Also, the aluminum salts of the instant products C] CAR I nay be obtained by treating the corresponding sodium H -C-CO0H(R") alt with an appropriate aluminum complex such as alu- 'CAY'QZO I ninum hydroxy chloride hexahydrate. etc. The ammo- R ium salts may be made by reaction with the correpending amine such as methylamine, diethylaminc, 4O I-hydroxyethylamine. pipcrazinc. piperidin'e, 0zme 0 B I aylbenzylamine. cyclohexylamine, triethylamine, ll R OCOR hcnethylamine, etc. The acid addition salts thusob- Cl CR" lined are the functional equivalent of the correspond 0 CH -CCOOH(R") 1g ,B-(p-cycloalkylphcnyl )lactic acid products and one H 2 I (led in the art will appreciate that to the extent that O R 1e instant acids are useful in therapy, the variety of OH OCGCH CH COOH r (c I CH C-C00H(R") (6 H f|3C0O H(R") I R j R R Q \O R 3 a B R where: OCOCH=CHCOOH R" is lower alkyl or CHff-COOMR") benzyl e i 6S 0COC H COOH :id addition salts embraced by this invention are liml :d only by the criterion that the bases employed in rming the therapeutically useful salts lie-both non xic and physiologically acceptable. The alkaloidal vlts are useful for effecting optical resolutions.

CHZ-(II-COOMR") O B R! I n a OCOOR" ClCOR" y n I m (e5 Q CH C-CO0H(R l O R e 0 H OCONH cicNH 2 (CH CH -?-C0OH(R") B I 0 B R' OH H 0CON(R"),,

ClCNR"R" H |:-c00H(R")--- M2)" V -CH -lCC00H(R") R R a B a R OSO R" where: ClSO R" (CH Q cH -c-c00H(R") R" is loweralkyl and l a Ar 1's phenyl or R tolyl B t i R 050 A? ClSO Ar lJOH(R") (CH Q cH c c l R q The corresponding acid salts. esters and amides of When it is desired to have an alkyl group in the B-pothe foregoing alcohol derivatives may he prepared acsition of the side chain. a Reformatsky reaction may be cording to the previously described procedures, or the carried out on a substituted p-cycloalkylphenyl alkyl alcohol derivatives may be prepared directly on the 50 ketone with an ol-halo acetate in the presence of zinc. acid salts, esters and amides, The resultant ,li-hydroxy-l3-alkyl-B-(p-cycloalkyl- B R" B OY 4.

A (CH -CH *C-COZ (CH l V -u1 I c0z 2 n O 2 I R R c a R a B RI OY phenyl)propionic acid is then dehydrated with acid at I raised temperatures to the ,8-alkyl-[3-(p-cycloalkyl- CH OH phenyl )aerylic acid. This may also be accomplished by g n 2 carrying out a Doebncr modification of the Perkin re- R action on the p-eycloalkylphcnyl alkyl kctone with ma- R lonie acid in the presence of pyridine to obtain the B-alylB-(p-cycloalkylphenyl)acrylie acid. This, in turn, is :hen reacted as previously described to obtain the deiired ,B-alkyl lactic, a-halopropionic' or a-thiopropionic lcids and derivatives.

These and other equivalent methods for the preparation of the acid, ester, amides, and salts of the instant products willbe apparent to those having ordinary skill in the-art -U.'S. Pat. No. 3,860,624 describes in detail A further method for preparing the compounds of 35 the preparation of substituted pcyclohexylphenyl alkahis invention is through the formation of a glycidic :ster by the condensation of the proper aldehyde or keone with an a-halo ester in the presence of an alkali ilkoxide, alkali amide, or alkali hydride. The u,B-cpoxy :ster is then reduced to the corresponding lactate vhich in turn is then reacted as previously described. "his method is also convenient in obtaining the afi-di- .lkyl compounds of this invention.

noic acid compounds including the compounds of the present invention, their compounding to useful pharmaceutical preparations, and their administration in therapy, dosage, and the like.

Since the B-earbon atom of the B-(3chloro-4- cyclohexylphenyl)-a-benzoyloxy propionic acid compound according to the present invention is substituted with hydrogen, the products of this invention are ob- EtC tained as racemie mixtures of their dextro and levorotatory isomers since the 0z-carbon is asymmetric. The raeemic mixture may then be resolved into dextro and le vorotatory optical isomers by conventional methods.

One method of resolution that may be employed is combining the racemic compound with an optically active compound by salt formation. ester formation, or amide formation to form two diasteromeric products. If the instant acids are added to an optically active base, then two diastereomeric salts are produced which posses different properties and different solubilities and can be separated by fractional crystallization. When the salts have been completely separated by repeated crystallization, the base is split off by acid hydrolysis and the pure d and l acids are obtained. Preferably, a cycloalkylphenyl-a-substituted propionic acid is reacted in alcoholic or acetone solution with an equivalent amount of the optically active primary, secondary or tertiary amine such as cinchonidine, cinchonine, quinine, ephedrine, a-methylbenzylamine, secbutylamine, see-amylamine, etc. The diastereomeric amine salts produced thereby, are separated by fractional crystallization and each optically salt is hydrolyzed with dilute mineral acid to produce the dextro or levo form of the cycloalkylphenyl-a-substituted propionic acid. Each optical isomer may be reacted then with YCl or YOY to produce the corresponding optically active alcoholic derivative. Alternatively, a cycloalkylphenyl-oz-substituted propionate ester may be reacted with an optically active primary or secondary amine such as ephedrine, a-methylbenzylamine, secbutylamine, etc, to produce a mixture of diastereomeric cycloalkylphenyl-a-substituted propionamide which may be separated by fractional crystallization. Each optically active amide may be hydrolyzed with mineral acid to its respective optically active acid.

Still alternatively, a cycloalkylphenyl-oz-substituted propionate may be reacted with an optically active alcohol such as l-menthol or d-borneol, or 1-0:- methylbenzylalcohol, to produce a mixture of diastereomeric cycloalkylphenyloz-substituted propionate esters which may be separated by fractional erystalliza tion. Each optically active ester may be hydrolyzed with mineral acid or alkali to its respective optically active acid. The optically active acids can also be recovered from the amethylbenzyl esters by hydrogenolysis in the presence of palladium. ln this manner the oz-oxy, a-halo, oz-thio, acyano or a-amino isomers may be pre pared.

l have found that the compounds of this invention exercise a useful degree of anti-inflammatory activity in mammals and are effective in the treatment of associated pain and fever and in like conditions which are responsive to treatment with anti-inflammatory agents. In general, the compounds of this invention are indicated for a wide variety of mammalian conditions where the symptoms of inflammation and associated fever and pain are manifested. Exemplary of such conditions are: rheumatic diseases such as rheumatoid arthritis, osteoarthritis and other degenerative joint diseases; soft tissue rheumatism such as tendinitis; muscular rheumatism such as sciatica; pain and inflammation associated with dental surgery and similar human and veterinary disease conditions exhibiting the foregoing symptoms requiring the use of an anti-inflammatory, analgesic and/or antipyrctic agent.

For these purposes, the compounds of this invention are normally administered orally, topically, parenterally or rectally. Orally, these may be administered in tablets, capsules, suspensions or syrups; the optimum dosage, of course. depending on the particular compound being used and the type and severity of the condition being treated. In any specific case the appropriate dosage selected will further depend on factors of the patient which may influence response to the drug; for example, general health, age, weight, etc. Although the optimum quantities of the compounds of this invention to be used in such manner will depend on the com pound employed and the particular type of disease condition treated, oral dose levels of preferred compounds when administered to a mammal in dosages of 0.5 to 100 milligrams per kilogram of body weight per day are particularly useful. The preferred range is 0.5 to 15 mg/Kg. Comparative dosages may be used in topical, parenteral or rectal administration.

Dosage forms may be prepared according to any method known to the art for the manufacture of pharmaceutical compositions and such compositions may contain one or more agents; for example. sweetening agents, flavoring agents, coloring agents, preserving agents, etc. Further, the active p-cycloalkylphenylozsubstituted propionic acids or their derivatives may be administered alone or in admixture with antacids such as sodium bicarbonate, magnesium carbonate, magnesium hydroxide, aluminum hydroxide, magnesium silieate, etc, and non-toxic pharmaceutically acceptable excipients. Such excipients may be, for example, inert diluents such as calcium carbonate, lactose, etc, granulating and disintegrating agents; for example maize startch, alginic acid, etc, lubricating agents; for example, magnesium stcarate, talc, etc, binding agents; for example, starch gelatin, etc, suspending agents; for example, methylcellulose, vegetable oil, etc, dispersing agents; for example, lecithin, etc, thickening agents: for example, beeswax, hard paraffin, etc, emulsifying agents; for example, naturally occu-ring gums, etc, and non-irritating excipients; for example, cocoa butter and polyethylene glycols.

Various tests in animals can be carried out to show the ability of the p-cycloalkylphenyla-substituted propionic acids and derivatives of this invention to exhibit reactions that can be correlated with anti-inflammatory activity in humans. One such test is the carrageenan paw edema test, which shows the ability of the instant compounds to inhibit edema induced by injection of an inflammatory agent such as carrageenan into the tissues of the paw of a rat against non-inflammed controls. This carrageenan testing method is known to correlate well with anti-inflammatory activity in humans and is a standard test used to determine I antiinflammatory activity. This correlation can be shown .by the activities of compounds known to be clinically active including such as aspirin, phenylbutazone, cortisone, hydroconisone, indomethacin and prednisolonc. In view of the results of this test, the pcycloalkylphenyl-a-substituted propionic acids and derivatives can be considered to be active antiinflammatory agents.

One method for measuring the pain and threshold of the p-cycloalkylphenyl-oz-substituted propionic acids and derivatives is the Randall-Selitto test. Analgesic activity is shown by antinocieceptive testing of the inflammed foot of rats and a measurement of their pain response.

Anti-pyretic assay is carried out by yeast-induced ever tests of subcutaneously injected rats. The meaurement of rectal temperatures is carried out to deternine the response by the test compounds.

In view of the results of the above tests, the pycloalky1pheny1-oz-substituted propionie acids and delvatives of this invention are considered to have valuble analgesic and antipyretic properties.

Other tests which can be correlated to show signifiant activities are the phenylquinone writhing test Jr analgesia, polyarthritis in rats" and ultra-violet rythema in guinea pigs."

The following are detailed examples which show the reparation of the compounds of this invention. They re to be construed as illustrations of said compounds nd not as limitations thereof.

EXAMPLE 1 3-Chloro-4-cyclohexylbcnzaldehyde p-Cyclohexylbenzaldehyde 71.5 g. (0.38 mole) and .1 g. of iodine (0.048 mole) are dissolved in .100 ml. f carbon tetrachloride. To this solution is added a soition of 40.4 g. (0.57 mole) of chlorine dissolved in 65 ml. of carbon tetrachloride over a period of 2 ours. During the addition, the temperature of the reetion mixture is maintained at C. The mixture is tirrcd for 3 hours and allowed to stand with gradual arming to room temperature over hours. The solent is removed by distillation under reduced pressure. he residue is fractionally distilled to obtain 3-chloro- -cyc1ohexylbenzaldchyde.

When p-cyclohcxylbenzaldehyde in the above exam- 1e is replaced with the aldehydes of Table 1 below. 1en the corresponding product of Table 11 below is rcpared.

Table 1 p-cyclopcntylbcnzaldehydc p-( 2 -methylcyclopcntyl )benzaldehyde p-eycloheptylbenzaldehyde p-( 2-methylcycloheptyl )benzaldehyde p( 2 -methylcyclohexyl )benzaldehyde p-( 3 -mcthylcyclohexyl )benzaldehyde p-(4'-methylcyclohexy1)benzaldehyde Table 11 3-ch1oro-4-cyclopentylbenzaldehyde 3-chloro-4-( 2 -methylcyclopentyl )benzaldehyde 3-chloro-4-cycloheptylbenzaldehydc 3-chloro-4-( 2 -methylcycloheptyl )benzaldehyde 3-chloro4-( 2 '-methylcyc1ohcxyl )benzaldehyde 3-ehloro-4-( 3 '-methylcyc1ohexy1 )benzaldehyde 3-chloro-4-( 4'-methylcyclohexyl )benzaldehyde EXAMPLE 2 3.5-dichloro-4-cye1ohexylbenzaldehyde p-Cyclohexylbenzaldehyde 35.8 g. (0.19 mole) and l g. of iodine are dissolved in 100 ml. of carbon tetrahloride. To this solution is added a solution of 56.7 g. 0.8 mole) of chlorine dissolved in 500 ml. of carbon :trachloride over a period of 3 hours. During the addion. the temperature of the reaction mixture is mainiined at 0C. The mixture is stirred for 3 hours and alvwcd to stand with gradual warming to room temperalI'C over hours. The solvent is removed in vacuo.

The residue is fractionally distilled to obtain 3.5- dichloro-4-cyclohexylbenzaldehyde.

When p-cyclohexylbenzaldehyde in the above exam plc is replaccd'by the benzaldchydes of Example 2, then the corresponding product ofTable I below is prepared.

Table l 3,5-dich1oro-4-cyclopentylbenzaldehydc 3 ,5-dichloro-4-( 2 -methylcyc1openty1)benzaldehyde 3,5-dichlor0-4-eycloheptylbenzaldehyde 3 ,5 -dichloro-4-( 2 '-methylcycloheptyl )benzaldehyde 3 .5-dichloro-4-( 2 -methy1cyclohexyl )benzaldehyde 3,5-dichloro-4-( 3 -methy1cyclohexy1)benzaldehyde 3,5-dichloro-4-( 4-methylcyclohexyl )benzaldehyde EXAMPLE 3 When bromine is used in place of chlorine in Examples 1 and 2, the products obtained are shown in Tables 1 and 11 below.

Table 1 3-bromo-4-cyclopentylbenzaldehyde 3-bromo-4-(2-methylcyclopentyl)benzaldehyde 3-bromo-4-cycloheptylbenzaldehydc 3-bromo-4-( 2 '-methylcycloheptyl )benzaldehyde 3-bromo-4-cyclohexylbenzaldehydc 3-bromo-4-( 2-cyc1ohexy1)benzaldehyde 3-bromo-4-( 3 '-cyelohexyl )benzaldehyde 3-bromo-4-( 4'-cyclohexyl )benzaldehyde Table 11 wwwww EXAMPLE 4 3-Nitro4-cyclohexylbenzaldehyde p-Cyclohcxylbenzaldehyde 12.4 g. (0.066 mole) is added to ice-cold concentrated sulfuric acid (18 ml.) and stirred with cooling for 5 minutes. Concentrated nitric acid (Sp. G. 1.51) (2.5 m1.) is added dropwise, maintaining the temperature between 30 and 40 by water cooling if necessary. After addition of the nitric acid is complete. the mixture is stirred for /2 hour, then poured into water. The mixture is made alkaline with sodium hydroxide. then extracted with ether. The ether extract is washed dried over sodium sulfate. evaporated and the residue is fraction-ally distilled to obtain 3-nitro-4-cyclohexylbenzaldehydc.

When p-cyclohexylbenzaldehyde in theabove example is replaced by the benzaldehydes of Example 1, then the corresponding product of Table 1 below is prepared.

Table l 3-nitro-4-cyclopcntylbenzaldehyde 3-nitro-4-( 2 '-methylcyclopentyl )benzaldehyde 3-nitro-4-cyclohcptylbenzaldehyde 3-nitro-4( 2 -methy1cycloheptyl )benzaldehyde 3-nitro-4-( 2 methylcyclohexyl )benzaldehyde 3-nitro-4-( 3 '-methylcyclohexyl )benzaldchyde 3-nitro-4-( 4 -methylcyelohexyl )benzaldehyde When p-cyclohexylbenzaldehydc in the above example is replaced by the benzaldehyde of Example 2 and Table l of Example 3, then the corresponding product of Table ll below is prepared.

Table 11' 3-chloro-5-nitro-4-cyclopentylbenzaldehyde 3 -ehloro--nitro-4-( 2 '-methylcyclopentyl benzaldehyde 3-ehloro-5-nitro-4-cycloheptylbenzaldehyde 3-ehloro-5-nitro-4-( 2 -methyleycloheptyl )benzaldehyde 3-chloro-5-nitro-4-( 2-methyleyclohexyl )benzaldehyde 3-chloro-5-nitro-4-( 3 '-methylcyclohexyl )benzaldehyde 3-ehloro-5-nitro-4-( 4 '-methylcyclohexyl benzaldehyde V 3-chloro-5-nitro-4-cyclohexylbenzaldehyde 3-bromo-5-nitro-4-cyelopentylbenzaldehyde 3-bromo- 5-nitro-4-( 2 '-methylcyclopentyl )benzalde hyde 3-bromo-5-nitro-4-cycloheptylbenzaldehydc 3-bromo-5-nitro-4'( 2-methylcycloheptyl )benzaldehyde 3-bromo-5 nitro-4-eyclohexylbenzaldchyde 3-brorno-5-nitro-4-( 2 -methylcyclohexyl )benzaldehyde 3-bromo-S-nitro-4-( 3 -methylcyclohexyl )benzaldehyde 3-bromo5nitro4( 4 -methylcyclohexyl )benzaldehyde EXAMPLE 5 3.5-Dinitro-4-cyclohexylbcnzaldehyde p-Cyclohexylbenzaldehyde 12.4 g. (0.066 mole) is added to icccold concentrated sulfuric acid (54 ml.) and stirred with cooling for 5 minutes. Concentrated nitric acid (Sp. G. 1.51) (7.5 ml.) is added dropwise. maintaining the temperature between and by water cooling if necessary. After addition of the nitric acid is complete, the mixture is stirred for 3 hours. then poured into water. The mixture is made alkaline with sodium hydroxide, then extracted with ether. The ether extract is washed, dried over sodium sulfite, evaporated and the residue is fractionally distilled to obtain 3,5- dinitro-4--cyclohexylbenzaldehyde.

When p-cyclohcxylbenzaldehyde in the above example is replaced by the benzaldehyde of Example I, then the corresponding product of Table I below is prepared.

Table l 3.5-dinitro-4-cyclopentylbenzaldehyde 3.5-dinitro-4-( 2-methylcyclopentyl )benzaldehyde 3.5-dinitro-4-cyeloheptylbcnzaldehyde 3 ,5-dinitro-4-( 2 -methylcycloheptyl )ben zaldehyde 3 .5-dinitro-4'( 2 -mcthylcyclohexyl )benzaldehyde 3 .5dinitro-4-( 3 -methylcyclohexyl )benzaldehyde 3 .5-dinitro-4-( 4'-methylcyclohexyl )benzaldehydc EXAMPLE 6 /3(3-chloro-4-cyclohexylphenyl)cinnamic acid A mixture of 22.2 g. (0.1 mole) of 3-chloro-4- cyclohexylbenzaldehyde is heated on a steam bath with 13.2 g. of malonie acid and ml. of pyridine containing 5 drops of piperidine. The mixture is heated for four hours until the liberation of carbon dioxide ceases. The cooled mixture is poured into a mixture of 1 10 ml. eoncentrated hydrochloric acid and 500 ml. of ice-water. The solid which separates is filtered. washed with 15 ml. portions of cold water and then resuspended in 200 ml. of cold water, filtered. washed with cold water and dried at 40C. The residue is then recrystallized from ethanol to obtain B.-(3-chloro-4-cyclohexylphenyl)ein- I namie acid.

When 3-chloro-4-cyclohexyl benzaldehydc in the above example is replaced with the bcnzaldehydes of Examples l-5 then the corresponding products of Table 1 below are obtained.

Table I ,B-(p-eyclopentylphenyl )cinnamic acid ,B-lp-( 2-methylcyclopentyl )phenyl lcinnamic acid ,B-( p-cycloheptylphcnyl )cinnamic acid B-[p-( 2-methylcycloheptyl)phenyl Icinnamic acid B-[p-( 2'-methylcyclohexyl )phenyl ]cinnamic acid B[p-( 3 'methylcyclohexyl )phenyl lcinnamic acid B-lp-(4'-methylcyclohexyl)phenyl]cinnamic acid /3( 3-chloro-4-cyclopentylphenyl )cinnamic acid B-l 3-chloro-4-( 2'-methylcyclopentyl )phenyl lcinnamic acid ,B-(p-cyclohexylph'cnyl )cinnamic acid B( 3,5-dichloro-4-cyclohexylphenyl )cinnamic acid B-( 3-chloro-4-cyclohcptylphenyl)cinnamic acid ,8-[ 3-chloro-4-( 2'-methylcyclohcptyl )phenyl Icinnamic acid ,B[3-chloro-4-( 2'-methylcyclohexyl )phenyl Icinnamic acid B-l 3-chloro-4-( 3 '-methylcyclohcxyl )phenyl lcinnamic acid B-l 3-chloro-4-( 4'-methylcyclohexyl )phenyl Icinnamic acid B-( 3,5-dichloro-4-cyclopentylphenyl )cinnamic acid ,8-[ 3.5-diehloro-4-( 2'-methylcyclopcntyl )phenyl cinnamic acid B-( 3,5-dichloro-4-cycloheptylphenyl )cinnamic acid B-[ 3.5-diehloro-4-( 2 '-methylcycloheptyl )phenyl lcinnamic acid B-[ 3 ,5-dichloro-4-( 2 '-methylcyclohcxyl )phenyl ]cin namic acid B-l 3.5-dichloro-4-( 3 '-mcthylcyclohexyl )phenyl lcinnamic acid ,B-l 3.5-dichloro-4-(4 methylcyclohexyl )phenyl ]cinnamic acid ,8-( 3-bromo-4-cyclopentylphenyl )cinnamic acid ,8-[ 3-bromo-4-( 2 methylcyclopentyl )phenyl Icinnamic acid B-( 3-bromo-4-cycloheptylphenyl )cinnamic acid B-l 3-bromo4-( 2'-methylcycloheptyl )phenyl lcinnamic acid ,8-( 3-bromo-4-cyclohexylphenyl )cinnamic acid /3-[ 3-bromo-4-( 2-cyclohexyl )phenyl lcinnamic acid ,B-[3-br0mo-4-( 3'-cyclohexyl)phenyl1cinnamic acid B-[ 3-bromo'4-( 4-cyclohcxyl )phenyllcinnamic acid ,8-( 3,5-dibromo-4-cyclopentylphenyl )cinnarnic acid /3-[ 3,5-dibromo-4-( 2-methylcyclopentyl )phenyl 1- cinnamic acid ,B-( 3 ,5-dibromo-4-cycloheptylphenyl )cinnamic acid ,B-[ 3 ,5-dibromo-4-( 2'-methylcycloheptyl )phenyl einnamic acid ethyl ,B-[ 3.5-dibromo-4-( 2 -methylcyclohexyl phenyl lactate ethyl B-[ 3,5-dibromo-4-( 3 '-methylcyclehexyl phenyl ]laetate ethyl B-[ 3,5-dibromo-4-( 4'-methylcyclohexyl phenyl ]lactate EXAMPLE 14 Ethyl ,8-( 3-nitro-4-cyclohcxylphenyl)lactate A sodium borohydride solution 1.142 g., 0.302 mole in 13 ml. of water containing 1 drop of N sodium hy' droxide) is added dropwise to a stirred solution of 18.4 g. (0.059 mole) of ethyl B-( 3nitro-4cyclohexylphenyl)pyruvate, methanol (50 ml.) and water (5 ml.) cooled in an ice-water mixture. The solution is partially neutralized with urea-active acid solution 15 ml. each of acetic acid and urea 0.041 mole). The pH after the addition is near neutral. The pH then is adjusted to acidic by addition of 18 N sulfuric acid (2.8 ml.). The product is extracted with ether, washed with 2 X ml. of saturated sodium bisulfite and then dried over anhy- I drous sodium sulfite for 2 hours. The drying agent is removed and the solvent is then removed to obtain ethyl B-( 3-nitro-4-cyclohexylphenyl )lactate.

When the above procedure is followed using the nitro compounds of this invention then the corresponding products are prepared ethyl ,8-[ 3-nitro-4-( 3-methylcyclohcxyl )phenyl ]lactate ethyl B-[ 3-nitro-4-( 4-methyleyclohexyl )phenyl lac tate ethyl B-(3-ehloro-5-nit1'o-4-eyclopentylphenyl)lactate ethyl ,B-l3-chloro-5-nitro-4-(2-methylcyclopentyl)- phenyl ]lactate ethyl ,3-( 3-chloro5-nitro-4-cyeloheptylphenyl )lac" tate ethyl ,B[3-chloro-5-nitro-4-(2'-mcthylcycloheptyl)- phenyl]lactate ethyl B-[3-chloro-5-nitro-4-(2-methylcyclohexyl)- phenyl ]lactate ethyl B-l 3-chloro-5-nitro-4-( 3 '-methylcyclohexyl phenyl ]lactate ethyl B-l 3-chloro-5-nitro-4-( 4 methylcyclohexyl phenyl ]acetate ethyl ,B-( 3-ehloro-5-nitro-4-cyclohexylphenyl)lactate ethyl B(3-bromo-5-nitro-4-cyclopentylphenyl)lactate ethyl B-[3-bromo-5-nitro'4-(2-mcthylcyclopentyl)- phenyl lactate ethyl B-( 3-bromo-5-nitro-4-cycloheptylphenyl )lactate ethyl B-[ 3-bromo-5nitro-4-( 2 "-methylcyclohexyl phenyl ]lactate ethyl ,8-[ 3-bromo5-nitro-4-( 3 -mcthylcyclohexyl phenyl ]lactate ethyl ,8[ 3-bromo-5-nitro4-( 4 '-methylcyclohcxyl phenyl ]lactate ethyl /3-(3,5-dinitro-4-cyelopentylphenyl)lactate ethyl B-[ 3 ,5-dinitro-4-( 2 '-methylcyclopentyl phenyl ]lactate ethyl B-( 3.5-dinitro-4-cycloheptylphenyl )lactate ethyl B-l 3,5-dinitro-4-( 2 '-mcthylcyclohcptyl phenyl]lactate ethyl B-[ 3 .5-dinitro-4-( 2'-methylcyelohcxyl phenyHIact'ate ethyl B-l 3.5-dinitro-4-( 3 -methylcyclohcxyl phenyl lactate ethyl B-l 3.5-dinitro-4-( 4'methylcyelohexyl phenyl lactate ethyl B-( 3,5-dinitro-4-cyclohcxylphcnyl )lactate EXAMPLE l5 Ethyl B-( 3-trifluoromethyl-4-cyclohexylphenyl )lactate To a solution of 0.01 moles of ethyl ,B-(3-bromo-4- cyclohexylphenyll-lactate in 50 ml. of dimcthylformamide is added 0.l5 moles of trifluoromethyl iodide and 0.02 g. of copper powder. The reaction is shaken in a sealed tube for 5 hours at l40C. cooled, and then filtered and evaporated in vacuo. 200 ml. of water is added to the residue and extracted with ether. The ether extract is dried, evaporated to dryness and dis tilled to obtain ethyl ,8-(3-trifluoromethyl-4-cyclohexylphenyl )lactate.

When ethyl B-(3-bromo-4-cyclohexylphenyl)laetate in the above example is replaced by equimolar amounts of the bromo compounds of this invention, then the corresponding trifluoromethyl product is obtained.

EXAMPLE l6 Ethyl B-( 3-amino-4-cyclohexylphenyl )lactate A mixture of 16.1 g. (0.05 moles) of ethyl B( 3-nitro- 4-cyclohexylphenyl)lactate in ml. methanol containing 0.05 mole citric acid and 1.5 g. of 5% palladium-on-carbon is shaken with hydrogen at 3 atm. pressure and 27C until 3 moles of hydrogen are absorbed. The mixture is filtered. washed with methanol and thefiltrate concentrated in vacuo to obtain ethyl L343-amino'4-cyclohexylphenyl)lactate.

When ethyl B-(3-nitro-4-cyclohexylphenyl )lactate in the above example is replaced by equimolar' amounts of the nitro compounds of this invention. then the corresponding products are obtained.

EXAMPLE l7 Ethyl ,8-( 3-methylamino-4-cyclohexylphenyl )lactate EXAMPLE l8 Ethyl ,8( 3-dimethylamino-4-cyelohexylphenyl )lactate A solution of 0.005 moles of ethyl B-(3-nitro-4- yclohexylphenyl)-lactate and 1.6 ml. of 37% formalehyde in 50 ml. of methanol is shaken with hydrogen ver 0.5 g. of 5% palladium-on-charcoal at 42 lbs. and 7C until five moles of hydrogen are absorbed. The atalyst is filtered off and the filtrate is evaporated in acuo. The residue is then distilled to obtain ethyl /3-( 3- imethylamino-4-cyclohexylphenyl )lactate.

When ethyl B-( 3-nitro-4-cyclohexylphenyl)lactate in 1e above example is replaced by equimolar amounts f the nitro compounds of this invention, then the cor- :sponding products are obtained.

EXAMPLE 19 Ethyl B-( 3-cyano-4eyclohexylphenyl )lactate To 29.1 g. (0.1 moles) of ethyl ,B-(3-amino-4- yclohexylphenyl)-lactate in 35 ml. of 28% hydrochloc acid and 100 ml. of cracked ice to maintain the temeratureat 0C is added a solution of 7.1 g. (0.102 roles) of sodium nitrite in 20 ml. of water. The reacon mixture is then neutralized with sodium carbonate. he diazonium mixture is added to a cuprous cyanide )lution (prepared from 31.5 g. of copper sulfate and 6.2 g. of sodium cyanide in 75 ml. of water). 250 ml. ftoluene is also added and the mixture is stirred for a hour. The reaction is then allowed to stir an addional 2 hours while warming gradually to 50C. This is ien cooled and the toluene separated, dried over soium sulfate and evaporated to dryness to obtain ethyl 3-cyano-4-cyclohexylphenyl )lactate.

When ethyl B-(3-amino-4-cyclohexylphenyl)lactate the above example is replaced by equimolar amounts ithe amino compounds of this invention, then the cor- :sponding products are obtained.

EXAMPLE 20 Ethyl B-( 3-fluoro-4-cyclohexylphenyl )lactate To 43.7 g. (0.15 moles) of ethyl ,8-(3-amino-4- lclohexylphenyl)-lactate is added at 0C 44 ml. of 1.5 oles of concentrated hydrochloric acid. The reaction ixture is maintained at 0C and the diazonium salt is 'epared with 23.2 g. (0.32 moles) of 95% sodium niite in 80 ml. of water. To this mixture is rapidly added solution of 10.4 g. (0.17 moles) of boric acid dislved in 22 g. (0.66 moles) of 60% hydrofluoric acid. 1e reaction mixture is then stirred for V2 hour and filred, washed with 3 X 25 ml. of water, 2 X 25 ml. of ethanol and 25 ml. of ether. The residual cake is then :ated in vacuo. The treated cake is then placed in a stilling flask and heated to permit spontaneous deamposition. After the decomposition. the residue is en fractionally distilled to obtain ethyl B-( 3-fiuoro-4- 'clohexylphehyl )lactate. When ethyl /3-(3-amino-4-cyclohexylphcnyl)lactate the above example is replaced by the amino com- )unds of this invention, then the corresponding prod :ts are obtained.

EXAMPLE 21 B-(3-Hydroxy-4-cyclohexylphenyl )laetic acid To 4.5 g. of ethyl B-( 3amino4-cyclohexylphenyl)- :tate suspension in 125 ml. of 8071 hydrochloric acid 1d cooled to 0C is added dropwise a solution of 1.2- of sodium nitrite in 15 ml. of water. After about 10 in.. 200 ml. of 50% hydrochloric acid is added porm wise and stirred for 15 hours. The reaction mixture is then poured onto ice water and extracted with chloroform, dried over sodium sulfate and concentrated in vacuo. The residue is crystallized to obtain B-( 3- hydroxy-4-cyclohexylphenyl)lactic acid.

The ethyl ester of the product is formed by reaction with absolute ethanol containing a small amount of anhydrous hydrochloric acid.

When ethyl ,8-( 3-amino-4-cyclohexylphenyl)lactate in the above example is replaced by equimolar amounts of the amino compounds of this invention, then the corresponding products are obtained.

EXAMPLE 22 Ethyl B-( 3-mcthoxy-4-cyclohexylphenyl )lactate To a stirred suspension of 0.01 moles of sodium hydride in 25 m1. of dry dimcthylformamide which has been cooled to 0C is added dropwise a solution of 0.01 moles of ethyl ,B-(3-hydroxy-4-cyclohexylphenyl)lactate in 10 ml. of dimethylformamide. The reaction mixture is stirred for 15 minutes and 0.015 moles of methyliodide is then added dropwise. The mixture is allowed to stir overnight at room temperature. 200 ml. of water is added and the resulting mixture is extracted well with ether. The ether extract is washed with water, dried over sodium sulfate, evaporated to dryness and distilled to obtain ethyl B-(3-methoxy-4-cyclohexylphenyl)laetate.

When ethyl B-(3-hydroxy-4-eyclohexylphenyl)lactate in the above example is replaced by equimolar amounts of the hydroxy compounds of this invention, then the corresponding products are obtained.

When 0.01 moles of acetyl chloride is used in place of methyliodide in the above reaction, then the product prepared is ethyl B-(3-acetyloxy-4-cyclohexylphenyl)- lactate.

EXAMPLE 23 B-( 3-Bromo-4-cyclohexylphenyl )lactic acid To 1 1.5 g. (0.044 moles) of ethyl ,8-( 3-amino-4- cyclohexylphenyl)lactate suspension in 225 ml. of 40% hydrobromic acid and cooled to 0C is added dropwise a solution of 2.34 g. of sodium nitrite in 30 ml. of water. To this mixture is added a solution of 20 g. of cuprous bromide in 350 ml. of 4071 hydrobromie acid added portion wise and stirred for 15 hours. The reaction mixture is then poured onto ice water, extracted with chloroform, dried over sodium sulfate and concentrated in vacuo. The residue is then crystallized to obtain ,8-(3- bromo-4-cyclohexylphenyl)lactic acid.

The ethyl ester of the product is formed by reaction with absolute ethanol containing a small amount of anhydrous hydrochloric acid.

When ethyl ,8-( 3-amino-4-cyclohexylphenyl)lactate in the above example is replaced by the amino compounds of this invention, then the corresponding products are obtained.

EXAMPLE 24 ,8-( 3-lodo-4-cyclohexylphenyl )lactic acid evaporated in vacuo. The residue is crystallized to ob tain ,B-(3-i0do-4-cyclohexylphenyl)lactic acid.

The ethyl ester of the product is formed by reaction with absolute ethanol containing a small amount of anhydrous hydrochloric acid.

When ethyl ,B-(3-amino-4-cyclohexylpheny1)lactate in the above example is replaced by equimolar amounts of the amino compounds of this invention, then the corresponding products are obtained.

EXAMPLE B-( 3-Mercapto-4-cyelohexylphenyl )lactic acid To 17.3 g. of ethyl /3-(3-amino-4-cyelohexylphenyl lactate in 11.1 ml. of concentrated hydrochloric acid and 20 g. of ice is added 4.1 g. of sodium nitrite in 2 ml. of water. This mixture is stirred for 10 min. and then added gradually to an ice cold solution of 10.3 g. of potassium ethyl xanthate in 14 ml. of water. The reaction is gradually heated over 45 minutes to 50C and stirred an additional 45 minutes. The mixture is then cooled, extracted with ether which is then washed with water, dilute sodium hydroxide and water, dried over sodium sulfate and evaporated in vacuo. The residue is dissolved in ml. of boiling ethanol to which is added gradually 13 g. of potassium hydroxide. The reaction is refluxed an additional hour and then evaporated to dryness in vacuo. The residue is dissolved in water and extracted with ether. The alkaline phase is acidified with 6N sulfuric acid and extracted with ether. The ether is washed with water, dried over sodium sulfate and evaporated to dryness to obtain ,84 3-mercapto-4-cyclo'hexylphenyl)lactie acid.

The ethyl ester of the product is formed by reaction with absolute ethanol containing a small amount of anhydrous hydrochloric acid.

When ethyl fi-(3-amino-4cyclohexylphenyl)lactate in the above example is replaced by equirnolar amounts of the amino compounds of this invention, then the corresponding products are prepared.

EXAMPLE 26 Ethyl B( 3-methylthio-4-cyclohexylphenyl )lactate To 3.85 g. of ethyl ,8-(3-rnereapto-4-cyclohexylphenyl)lactate in ml. of water containing 0.65 g. of sodium hydroxide is added 2 ml. of dimethyl sulfate with stirring. The reaction mixture is gradually warmed to 40C and stirred for 2 hours. The mixture is cooled and extracted with ether which is washed with water. dried and evaporated in vacuo. The residue is distilled to obtain ethyl B-(3-methylthio-4-eyclohexylphenyl)' lactate.

When the above B-(3-methylthio-4-cyclohexylphenyl )lactate is treated with 3071 H 0 then the resul tant product is ethyl [3% 3-methyl-sulfinyl-4-cyclohexylphenyl)lactate or ethyl cyclohexylphenyl)lactate.

When ethyl ,B-(3-mercapto-4-cyclohexylphenyl)lactate in the above example is replaced by the mercapto compounds of this invention, then the corresponding products are prepared.

When a equimolar amount of acetyl chloride is used in place of dimethyl sulfate in the above reaction, then the product prepared is ethyl B-( 3-acetylthio-4- cyclohexylphenyl)lactate.

B-( 3-methylsulfonyl-4 EXAMPLE 27 Ethyl ,8-( 3-nitro-5-trifluoromethyl'4-cyelohexylphenyl )lactate To a solution of 0.01 moles of ethyl B-(3bromo-5 nitro-4-cyelohexylphenyl )lactate in 50 ml. of dimethylformamide is added 0.15 moles of trifluoromethyl iodide and 0.02 g. of copper powder. The reaction is shaken in a sealed tube for 5 hours at 140C, cooled, filtered and evaporated in vacuo. 200 ml. of water is added to the residue and extracted with ether. The ether extract is dried, evaporated to dryness and distilled to obtain ethyl B-(3-nitro-5-trifluoromethyl-4- eyclohexylphenyl)lactate.

When ethyl B-( 3-bromo-5-nitro-4-cyclohexylphenyl)laetate in the above reaction is replaced by ethyl ,8-( 3-bromo-5-fluoro-4-cyclohexylphenyl )lactate or ethyl B-(3-bromo-5-ehloro-4-cyelohexyphenyl)lactate, then the products obtained are ethyl B-(3-fluoro- S-trifluoromethyl4-cyelohexylphenyl )lactate and ethyl /3-( 3-chloro-5-trifluoromethyl-4-cyclohexylphcnyl )lactate.

EXAMPLE 28 Ethyl B-( 3-amino-5-nitro-4-eyclohexylphenyl )lactate A mixture of 17.6 g. (0.05 moles) of ethyl B435- dinitro-4-cyclohexylphenyl)lactate in ml. of methanol containing 0.05 moles of citric acid and 1.5 g. of 5% palladium-omcarbon is shaken with hydrogen at 3 atm. pressure and 27C until 3 moles of hydrogen are absorbed. The mixture is filtered, washed with methanol and the filtrate concentrated in vacuo to obtain ethyl ,8-( 3-amino-5-nitro-4-cyclohexylphenyl )laetate isolated as the citrate salt.

When ethyl ,B-(3,5-dinitro-4-cyelohexylphenyl)lactate in the above example is replaced by ethyl [3-(3- chloro-5-nitro-4-eyclohexylphenyl)lactate, ethyl ,8-(3- bromo-S-nitro-4-cyclohexylphenyl )lactate, ethyl B-( 3 fluoro-S-nitro-4-cyclohexylphenyl)lactate or ethyl B-( 3-trifluoromethyl-5-nitro-4-cyclohexylphenyl )lactate, then the products obtained are ethyl B-(3-amino- 5-chloro-4-cyclohexylphenyl )lactate, ethyl ,8-( 3- amino-5-bromo-4-cyclohexylphenyl )lactate, ethyl B-(3-amino-S-fluoro-4-cyclohexylphenyl)lactate and ethyl ,8-( 3-amino-5-trifluoromethyl-4-cyclohexylphenyl)laetate.

EXAMPLE 29 When the procedures of Examples l-28 are followed using the appropriate starting material, then the corresponding product is obtained. 

1. A B-(3-CHLORO-4-CYCLOHEXYLPHENYL) A-BENZOYLOXY PROPIONIC ACID COMPOUND OF THE FORMULA
 2. Beta -(3-chloro-4-cyclohexylphenyl) Alpha -benzoyloxy propionic acid of the formula 